Answer:
The correct answer is option D. night view
Explanation:
The first option, the hands-free setting, is a feature of the car which allows you to speak over the phone without using your hands and allowing you to maintain full control of the steering wheel and the gear shift lever, and it does not have anything to do with the rearview mirror.
Option B, cleaning solution, while it may be useful in order to clean your rearview mirror, that is a thing that shouldn't be done at night, because you are not able to clearly see at night if you wiped it down for good, and you might leave some residue that possibly could bother you when looking at the mirror.
Windshield wiper fluid isn't for cleaning your rearview mirror, but for helping removing residue/bugs stuck on your windshield.
Finally, option D, night view, is the correct option. Night view is a setting of rearview mirrors that is quite useful at night, because it reduces the amount of light reflected to the driver, avoiding the glare of high-beam headlights of cars behind to be directly reflected to the driver's eye that would make quite hard to focus in the dark ahead. It works by tilting the mirror out of line with the driver's view. In day mode, the reflection seen by the driver comes from the reflective surface, while in night view, the reflection comes from the glass, which only reflects a fraction of the light that the reflective surface does.
